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How many effective codons are there for ...

How many effective codons are there for the synthesis of twenty amino acids

A

64

B

32

C

60

D

61

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The correct Answer is:
d
d) out of 64 codons, 61 codons code for amino acids and the rest three UAG, UAA and UGA are stop codons(i.e. do not specify any amino acids)
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